Rafa was going to play against Novak Djokovic in the football field, hoping to break the record of public attendance at a tennis event and, at the same time, raise money for Rafa Nadal Foundation and also for Real Madrid Foundation.

In a press statement released on Tuesday, Nadal apologizes to all and "in particular to the fans that had already purchased a ticket to such agood cause". "The doctors have been checking my knee and i suffer a tendinitis which will have me awayfrom any practice or matches for 15 days, which makes it impossible to play with NovakDjokovic as we'd expected and announced. I was with my doctors on Monday and startedalready my treatment with the goal to be ready for the London Olympic Games and representSpain once again", says Nadal in his statement to the media.

Nadal will start rehab and hopes to recover in time for 2012 London Olympics, which will start in just 22 days.